水土保持研究2024，Vol.31Issue(2)：84-91,8.DOI:10.13869/j.cnki.rswc.2024.02.044
模拟干旱下杨树树干液流特征及其对环境因子的响应
Characteristics of Poplar Populus deltoides Stem Sap Flow and Its Response to Environmental Factors Under Simulated Drought
摘要
Abstract
[Objective]The Objectives of this study are to estimate the effects of throughfall exclusion(drought)on the sap flow in a Populus deltoides plantations and to enhance our understanding of the response of poplar plantations to changes in global precipitation patterns.[Methods]The study was conduc-ted from September 2018 to November 2020 in a 10-year old poplar plantation in Dongtai Forest Farm.There were three treatments in this study,including CK(control),D1(30% throughfall exclusion),and D2(50% throughfall exclusion).The sap flow density and environmental factors were continuously measured by ther-mal diffusion probe technology and the Micro Weather Monitoring System to evaluatethe response of the poplar plantation to environmental factors.[Results](1)In three treatments,the annual variation of sap flow in poplar plantations showed a single peak,similar to the interannual variation of vapor pressure deficit and photosynthetic active radiation.The sap flow rate reached its peak in summer,and then gradually decreased over time.In the dormant period,the sap flow density approached zero.(2)In the drought treat-ment,the sap flow decreased with the increasing throughfall exclusion.The average sap flow density in the growth seasons of D1 and D2 were 39.61 and 31.85 g/(m2 s),respectively,which were significantly reduced by 24% to 39% compared to the control(p<0.05).(3)The mixed effect model showed that the vapor pressure deficit and soil temperature were extremely significantly correlated with sap flow(p<0.01),while air temperature,rainfall,and soil temperature were significantly correlated with sap flow(p<0.05).[Conclusion]In D1 treatment,the power of explanation of environmental factors to sap flow increased,and the sensitivity sap flow to environmental changes could be increased in drought treatments.Among them,soil temperature was significantly correlated with sap flow.Further exploration of the response of tree traits to the environment is needed in the future.关键词
干旱/树干液流密度/土壤体积含水量/热扩散探针技术Key words
drought/sap flow density/soil volumetric water content/thermal diffusion probe分类
农业科技引用本文复制引用
张星宇,杨金艳,阮宏华,张瑞婷..模拟干旱下杨树树干液流特征及其对环境因子的响应[J].水土保持研究,2024,31(2):84-91,8.基金项目
国家重点研发计划(2021YFD22004) （2021YFD22004）
江苏省林业局揭榜挂帅项目(LYKJ[2022]01) （LYKJ[2022]01）
江苏林业局造林专项([2021-2022]) （[2021-2022]）
